Loop-retainer for sewing-machines.



J. R. MOFPATT.

LOOP RETAINER FOR SEWING MACHINES. APPLICATION FILED MAY 23, 1912.

1,097,041 Patented May 19, 1914.

2 SHEETS-SHEET 1.

awuvnto'c X/AL/ J. R. MOFFATT.

LOOP RETAINER FOR SEWING MACHINES.

APPLICATION FILED MAY 23,,1912. 7041 J Patented May 19, 1914.

2 SHEETS-SHEET 2.

' ll @Wis'dlldt -UN1TED-STATES PATENT oFFioE.

STAKES R. MOFFATT, 01? OAK PARK, ILLINOIS, ASSIGNOR TO UNION SPECIAL MAGKINE CUMBANY, OF CHICAGO, ILLINOIS, A CORPORATIQN OF ILLINOIS.

. LOOP-RETAINER FOR snwrnemacninns.

Specification of Letters Patent.

Patented May 19, 19 14.

Application filed ma 23, 1912. Serial No. 699,217.

To all whom it mat concern:

Be it known that L'UAMES R. MoFFAT'r, a

citizen of the United States, residing at ()ak Park, in the county of Cook, State of Illinois, have invented, certain new and useful Im rovements 1n Loop-Retainers for Sewingachines, of which the following is a descriptiomreferen'ce being bad to the accompanying drawing andto the figures of reference marked thereon.

My invention relates to improvements in sewing machines, and particularly to a con struction of throat plate and loop retainer with means for supporting and adjusting the loop retainer attached to the under side of the'throat plate, the purpose of which loop retainer is to retain the loops of needle thread far enough to the right to allow the formation of the triangular spaces, between the backs of the loopers, the looper threads on the'left and the needle threads on the right,into which the needles must descend.

I have'shown my invention as applied to the throat plate of a flat bed machine. in

which two pairs of slabbed shank needles arranged at points oblique to each other re-. specting the line of feed are employed, with two loopers cooperating therewith to form stitches but it will be understood that I do not ads to be so limited.

It is a matter of considerable nicety. to properly adjust the loop retainers, they being secured on the under side of the throat plate, and heretofore it has been necessary to approximately adjust them to position by loosening the set screws on the under side of the throat plate, which means removal of the-throat plate from the machine, adjusting them lengthwise, then replacing the throat plate in the machine, and it is sometimes necessary to repeat this operation several times.

The object of the present invention is to provide a throat plate and a loop-retaining device which can be readily adjusted thereon.

The invention is illustrated in the accom panying drawings, in which Figure '1 is a perspective view of a throat plate having my improved means for. scour-- ing loop retainers thereto, the needles and loopers being shown in outline, the parts being adapted to the well known Union Special two-line machine; Fig. 2 is a sectional body.

side view; Fig. 3 a bottom plan vview; and Fig. 4 is a perspective view of a sewing machine embodying the invention In these drawings, 1 represents the needles plate is shown at 3, and has the openings 4 for the passage of the needles, and the slots for the passage of the feed dogs. 'On'the' under side of the throat plate are longitudinal slots 5, in which the loop retainer shanks 6 are set, being retained by the set screws 7, which pass into the throat plate from the under side, the inner faces of the heads (if the screws clamping the loop retainerslin place. At their outer ends, the shanks of the loop retainers are bent as at 9 to entend through the throat plate slots 15, which are cut. through. the throatplate, whereby .the

and 2 the cooperat ng loopers. The threat loop retainers may be shifted longitudinally after the screws have'been loosely clamped on the retainers. The inner or upper ends of the set screws 7 are nicked, so as to be engaged by a screw driver, by,which. they may be manipulated from the top of the throat plate and thoroughly tightened. The small screws 8 pass through the throat plate andbear upon the forward or spring portion of the retainers, thus giving a slight vertical adjustment thereto, and one of the loop retainers has its end l0 bent at an angle to-the In operation, the shanks of the retainers are inserted in the longitudinal slots of the throat plate, and the screws 7 tightened to hold them from dropping out; the throat plate is then placed in position in the machine, and the-retainers adjusted longitudinally to correct position by manipulation of the upwardly projecting portions 9 of the shanks. The screws 7 are then tightenedloop-retaining] device, means for securing said loop-retaining device, said means including a single member operable from both sides of said throat plate.

3. In a sewing machine throat plate, a loop-retaining device, means for securing said loop-retaining device to the under side of the throat plate, said means including a device operable from both sides of said throat plate.

4:. In a throat plate for sewing machines, a loop-retaining device, guiding means for said loop-retaining device, said guiding means being extended to the outer edge of said throat plate.

5. In a throat plate for sewing machines, a loop-retaining device, guiding means for said loop-retaining device, said guiding means extending from one side of said throat plate to another.

6. In a throat plate for sewing machines, a loop-retaining device, means for permitting said loop-retaining device to be adjusted longitudinally, and means to hold said retaining device in proper vertical po sition during the adjustment. thereof.

7. In a sewing machine, a bed plate, a throat plate, and means to support said throat plate, said throat plate being provided with ,a loop-retaining device on its lower side, means for permitting adjustment of said loop-retaining device, said means being accessible without removing the throat plate from its support.

8. The combination of a throat plate for sewing machines with a loop-retaining 'device, and means fdr securing said loopretaining device beneath the throat plate, said throat plate having an opening at its edge and said loop-retaining device having its shank bent at an angle and extending into said opening. I

9. In a throat plate for sewing machines, a loop retainer, a groove for said loop retainer, means to hold said loop retainer in said groove, said loop-retaining device car rying means for permitting its longitudinal adjustment while the throat plate is in 0perative position.

10. In a throat plate for sewing machines,

a loop-retaining device, means to adjust the vertical position of the free end thereof, and means to permit its longitudinal adjustment while the throat plate is in operative position. 11. In combination with a. sewing machine throat plate, a loop retainer, and means for securing theretainer to the throat plate, comprising a clamping screw secured to the throat plate, and means for operating said screw both from its head and from the shank.

12. In combination with a sewing machine throat plate, jecting upward from the bottom of the throat plate and having a clamping head to clamp/the retainer in position, said screw being provided with means on its upper end, whereby it may be manipulated and tightened or loosened from the upper side of the throat plate.

18. The throat plate having a slot in its under side for the shank of the loop retainer, a clamping screw inserted from the under side of the throat plate to hold the shank in its slot, the opening in the throat plate to receive the clamping screw extending through the throat plate, and the upper end of the screw being adapted to be operated by a screw driver or other tool, the

shank of the retainer having an upwardly extending end portion, said throat plate having an opening leading from said longitudinal slot and adapted to receive said upwardly extending end, and a screw for adjusting the forward free end portion of the loop retainer. v

In testimony whereof, I afiix my signature, in the presence of two witnesses.

JAMES R. MOFFATT.

Witnesses:

C. MGNEIL, F. S. NORTH.

a loop retainer, a screw pro- 

